The 'fatigue' failure in steel structures is governed primarily by:
Choose the correct answer
Maximum stress intensity alone
Stress range (Δσ) and number of cycles — low stress range but many cycles causes fatigue fracture
Compressive stress only
Temperature changes
Correct Answer
B. Stress range (Δσ) and number of cycles — low stress range but many cycles causes fatigue fracture
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Fatigue: failure under repeated stress cycling BELOW ultimate strength. Governed by: stress RANGE (Δσ = σmax − σmin, not stress magnitude); number of cycles N; joint detail category (S-N curve). IS 800 Appendix F: fatigue categories for various weld and bolted details. Smooth polished plate: highest fatigue strength; severe weld notch: lowest. Fatigue life: Nf × (Δσ)³ = K (Miner''s rule).
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